Odds ratios (OR) and their 95% confidence intervals (CI) for crude and adjusted ordinal logistic regression analyses on association between lumbar disc degeneration (DD) sum score (in four ordinal classes) and measures of abdominal obesity.

aAdjusted for heavy physical work, driving motor vehicle, lifting heavy objects at work, previous musculoskeletal injury, socioeconomic status and education.bAdjusted for heavy physical work, previous musculoskeletal injury, socioeconomic status and education.ORs indicate relative change in odds for DD sum score equal to or greater than any given sum score when compared with all lower classes. In cases not violating the proportionality assumption, only the OR common to all sum score levels is shown. Otherwise, ORs are shown separately for each level of the outcome.